We are using the following endpoint to add songs to a user's library playlist: https://developer.apple.com/documentation/applemusicapi/add_tracks_to_a_library_playlist
However, it looks like it is currently only possible to add tracks to the end of a playlist, and there is no way of re-ordering the tracks either. It would be great if we were able to pass an index of the position where the object should be added within the playlist, or if that's too complicated, then at least have a param that allows to add tracks to the beginning of the playlist.
Adding new tracks at the end of a playlists that already has a lot of songs just isn't effective as they won't be discovered.